Valve.



J. P. L. HALYBURTON.

VALVE.

APPLICATION FILED JULY 21, 19o5 2 SHEBTQ-SHEET 1.

W. 1 A F flan m 0 3. m1, 1 \w INVENTUR J. P. L. HALYBURTON.

' I 'VALVE.

APPLICATION FILED JULY 21,1905.

Patentedv Oct. 27, 1908.

2 SHEETS-SHEET 2.

FFTCE.

JOHN P. L. HALYBURTON, OF OOHOES, NEW YORK.

VALVE.

at Cohoes, county of Albany, and State of New York, have invented certain new and useful Improvements in Valves, of which the following is a specificatlon.

The invention relates to such improve-I ments and consists of the novel construetion and combination of parts hereinafter dei oval in form with the longitudin scribed and subsequently claimed.

Reference may be had to the accompanymg drawings, and the reference characters marked thereon, which form a part of this specification.

Similar characters refer to similar parts in the several figures therein.

Figure l of the drawings is a central, vertical, longitudinal, section of my improved valve. Fig. 2 is a view in elevation of the gates, wedge and stem-nut in the relative positions assumed at the end of the seating movement of the stem-nut. Fig. 3 similar view showing the relative positions after the gates have been fully seated and the stem-nut slightly withdrawn to relieve the stem from strain. Fig. 4 is a top plan view of the wedge. Fig. 5 is a view in side elevation of the same. Fig. 6 is a view in side elevation of the stemnut. Fig. 7 is a central, vertical section of the same taken on the broken line 77 in Fig. 6. Fig. 8 is a view in elevation of the back of the main gate. Fig. 9 is a horizontal cross-section of the same taken on the broken line 99 in Fig. 8. Fig. 10 is a vertical cross-section of the same taken on the broken line 10-1O in Fig. 8. Fig. 11 is a view in elevation of the back of the auxiliary gate. Fig. 12 is a central, vertical section of the same taken on the broken line 1212 in Fig. 11.

My invention relates to slide-gate valves em loying double gates.

ertain objects of the invention are to secure greater accuracy in the seating of the gates, to permit a degree of universal adj ustable movement between the two gates, and to relieve the stem from strain under certain conditions when the valve is closed.

Referring to the drawings, 1, is the case having the straight-way passage, 2, surrounded by the valve seats, 3, the ports Specification of Letters Patent.

Application filed July 21, 1905.

Patented. Oct. 27, 1908.

Serial No. 270,606.

through which seats are adapted to be closed by the main gate, 4, and auxiliary-gate 5.

The gates are moved to and from a osition opposite their seats by means of the stem-nut, 6, fitting a screw-threaded portion, 7, of the valve-stem which projects exteriorly of the case and is adapted to receive operating mechanism, as the hand wheel 8.

The stem-nut, 6, is provided with oppositely projecting trunnions, 9, preferably a axis 6X- tending vertically, and the auxiliary gate is mounted upon the stem-nut by means of flanges or lugs, 10, formed on the back of the auxiliary-gate and at a distance apart adapted to receive between them the body of the stem-nut, which flanges or lugs have bearing apertures, 11, adapted to receive the respective trunnions on the stem-nut, said bearing apertures being open on the inner or back side of the flange as shown at, 12, and said openings, 12, being adapted to permit the insertion therethrough of the respective trunnions on the stem-nut when the stemnut and gate are placed in a position at right angles to each other.

After the trunnions have been thus inserted into the bearing apertures, 11, the nut and gate are caused to occupy parallel planes whereby the trunnions are properly located in their respective bearing a ertures, which apertures are vertically e ongated sufiiciently to not only receive said trunnions but to permit more or less lost motion between the stem-nut and gate.

The main gate, 4, is provided near its upper end with a pair of lu s, 13, projecting inwardly from the back tiereof and adapted to occupy the openings, 12, in the respective lugs, 10, on the auxiliary gate whereby said main gate is supported and carried by the auxiliary gate, the auxiliary gate alone being mounted directly upon the stem-nut by means of the trunnions as above described.

The gates are forced against their respec tive seats by means of the wedge, 14, the overhanging head, 15, of which is adapted to engage flanges, 16, formed in the backs of the respective gates whereby said Wedge is supported anc raised by the gates when t e gates are raised by the movement of the stem-nut in opening the valve.

The wedge is provided on one side with a plane inclined surface, 21, adapted to engage a similarly inclined plane surface, 17, on the back of the auxiliary ate and on its opposite side with a curve inclined'surface, 18, adapted to engage a similarly inclined surface, 19, of somewhat less curvature forlImCL on the back of the main gate 4.

The inclination of the engaging surfaces, 21 and 17, on the wedge and auxiliary gate respectively is considerably greater than that of the inclined surfaces, 18 and 19, on

the wedge and main gate respectively, as a result of which I am able to so distribute the pressure exerted by the fluid supply upon the main gate that the valve after having been closed by the action of the valve-stein will automatically remain closed without the continued maintenance of strain upon the stem. In valves of this general type wherein the gates are forced to their seats by means of a wedging device it is very desirable that the engaging surfaces on the wedge and respective gates should be so inclined that the parts will readily free themselves when the stem is 0 erated to open the valve, but it is found d' icult to so lncline said surfaces without making it necessary for the stem to exert a considerable pressure through the stem-nut in order to maintain the gates closed.

In carryin out my invention I have divided the inc ination unequally between the wedge and the respective gates, giving the greater inclination to the engaging surfaces on the wedge and auxiliary gate which I am able to do by reason of the fact that a wedging action upon the auxiliary gate due to fluid pressure upon the main-gate serves to force said auxiliary gate more tightly against its seat thereby greatly increasing the sliding friction between said gate and seat which serves to prevent such a movement; and I give to the engaging surfaces on the wedge and main gate respectively as great a degree of inclination as possible without permitting said main gate to be forced by the fluid pressure thereupon to slide upwardly upon the wedge.

It will be readily seen that the engaging surfaces, 18 and 19, on the wedge and main gate respectively can be sufficiently inclined to permit the gate to be freed by a very slight uplward force applied directly to the gate, w ile the gate would be enabled to resist a very great force applied to its face without any resultant movement due to wedgewise action.

By making provision for lost motion between the stem-nut and auxiliary gate through which auxiliary-gate the main-gate is operated I am able to relieve the stem from strain after the valve has been fully closed by sim ly reversing the movement of the stem su' iciently to relieve the pressure of the stem-nut-trunnions upon the auxiliary-gate, as shown in Fig. 3.

The construction shown and described permits of a substantially universal adjustment ,ofione gate relatively to the other and of the gates relatively to the stem-nut. Thus the auxiliary gate is capable of rocking adjustment on the stem-nut-trunnions, the main gate is free to adjust itself by either a swinging or sliding movement permitted by its flange or lug connections, 13, with the auxiliary gate, and the curved inclined engaging surfaces, 18 and 19, on the wedge and main gate respectively permit the main gate to have a rotative adjustment upon the wedge.

For certain purposes of my invention the gates may be su ported and carried by the stem-nut in any nown manner whereby lost motion between the stem-nut and gates is made possible.

The wedge is provided in its lower end with an adjustable stop-screw, 20, adapted to engage with the bottom of the valve-case ada ted to arrest the downward movement of the wedge in the operation of closing the valve, by adjustment of which screw compensation can be made for wear upon the inclined engaging surfaces upon the wedge and respective gates as well as for diminution in thickness of the gates due to resurfacing the same. Said screw is accessible for adjustment through either of the seat apertures when the valve is open.

What I claim as new and desire to secure by Letters Patent is 1. In a slide-gate valve, the combination with the case; stem; and stem-nut having oppositely projecting trunnions; of a Wedge having on its opposite sides inclined surfaces of different degrees of inclination; an auxil iary gate having lugs provided with apertures adapted to loosely receive and permit lost motlon of said trunnions, and an inclined surface corresponding in inclination with and adapted to engage the surface of greater inclination on said wedge; and a main gate carried by said auxiliary gate and having an inclined surface corresponding in inclination and engageable with the surface of lesser inclination on said wedge.

2. In a slide-gate valve, the combination with the case; stem and stem-nutsh'aving oppositely projecting trunnions; of a wedge having on one side a plane inclined surface and on the opposite side a curved inclined surface, said surfaces being of diflferent de grees of inclination; and a pair of gates loosely connected with each other, one having a lane inclined surface correspondin in incllnation and engageable with the sim' ar surface on said wedge and the other having a curved inclined surface corresponding in in- In testimony whereof, I have hereunto set clination and engageable vgith tlhe similfiir sur- I my hand this 1st day of June, 1905.

face on said Wedge, one o saic ates avin on its back a pair of lugs or fiar fges adapted JOHN HALYBURTON' to receive between them said stein-nut and provided with bearing apertures for the trunnions on the stem-nut.

Witnesses:

E. M. OREILLY, H. E. OURTIs. 

